| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/shell/platform/windows/text_input_plugin.h" |
| #include "flutter/fml/string_conversion.h" |
| #include "flutter/shell/platform/common/text_editing_delta.h" |
| |
| #include <windows.h> |
| |
| #include <cstdint> |
| |
| #include "flutter/shell/platform/common/json_method_codec.h" |
| |
| static constexpr char kSetEditingStateMethod[] = "TextInput.setEditingState"; |
| static constexpr char kClearClientMethod[] = "TextInput.clearClient"; |
| static constexpr char kSetClientMethod[] = "TextInput.setClient"; |
| static constexpr char kShowMethod[] = "TextInput.show"; |
| static constexpr char kHideMethod[] = "TextInput.hide"; |
| static constexpr char kSetMarkedTextRect[] = "TextInput.setMarkedTextRect"; |
| static constexpr char kSetEditableSizeAndTransform[] = |
| "TextInput.setEditableSizeAndTransform"; |
| |
| static constexpr char kMultilineInputType[] = "TextInputType.multiline"; |
| |
| static constexpr char kUpdateEditingStateMethod[] = |
| "TextInputClient.updateEditingState"; |
| static constexpr char kUpdateEditingStateWithDeltasMethod[] = |
| "TextInputClient.updateEditingStateWithDeltas"; |
| static constexpr char kPerformActionMethod[] = "TextInputClient.performAction"; |
| |
| static constexpr char kDeltaOldTextKey[] = "oldText"; |
| static constexpr char kDeltaTextKey[] = "deltaText"; |
| static constexpr char kDeltaStartKey[] = "deltaStart"; |
| static constexpr char kDeltaEndKey[] = "deltaEnd"; |
| static constexpr char kDeltasKey[] = "deltas"; |
| static constexpr char kEnableDeltaModel[] = "enableDeltaModel"; |
| static constexpr char kTextInputAction[] = "inputAction"; |
| static constexpr char kTextInputType[] = "inputType"; |
| static constexpr char kTextInputTypeName[] = "name"; |
| static constexpr char kComposingBaseKey[] = "composingBase"; |
| static constexpr char kComposingExtentKey[] = "composingExtent"; |
| static constexpr char kSelectionAffinityKey[] = "selectionAffinity"; |
| static constexpr char kAffinityDownstream[] = "TextAffinity.downstream"; |
| static constexpr char kSelectionBaseKey[] = "selectionBase"; |
| static constexpr char kSelectionExtentKey[] = "selectionExtent"; |
| static constexpr char kSelectionIsDirectionalKey[] = "selectionIsDirectional"; |
| static constexpr char kTextKey[] = "text"; |
| static constexpr char kXKey[] = "x"; |
| static constexpr char kYKey[] = "y"; |
| static constexpr char kWidthKey[] = "width"; |
| static constexpr char kHeightKey[] = "height"; |
| static constexpr char kTransformKey[] = "transform"; |
| |
| static constexpr char kChannelName[] = "flutter/textinput"; |
| |
| static constexpr char kBadArgumentError[] = "Bad Arguments"; |
| static constexpr char kInternalConsistencyError[] = |
| "Internal Consistency Error"; |
| |
| namespace flutter { |
| |
| void TextInputPlugin::TextHook(const std::u16string& text) { |
| if (active_model_ == nullptr) { |
| return; |
| } |
| std::u16string text_before_change = |
| fml::Utf8ToUtf16(active_model_->GetText()); |
| TextRange selection_before_change = active_model_->selection(); |
| active_model_->AddText(text); |
| |
| if (enable_delta_model) { |
| TextEditingDelta delta = |
| TextEditingDelta(text_before_change, selection_before_change, text); |
| SendStateUpdateWithDelta(*active_model_, &delta); |
| } else { |
| SendStateUpdate(*active_model_); |
| } |
| } |
| |
| void TextInputPlugin::KeyboardHook(int key, |
| int scancode, |
| int action, |
| char32_t character, |
| bool extended, |
| bool was_down) { |
| if (active_model_ == nullptr) { |
| return; |
| } |
| if (action == WM_KEYDOWN || action == WM_SYSKEYDOWN) { |
| // Most editing keys (arrow keys, backspace, delete, etc.) are handled in |
| // the framework, so don't need to be handled at this layer. |
| switch (key) { |
| case VK_RETURN: |
| EnterPressed(active_model_.get()); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| TextInputPlugin::TextInputPlugin(flutter::BinaryMessenger* messenger, |
| TextInputPluginDelegate* delegate) |
| : channel_(std::make_unique<flutter::MethodChannel<rapidjson::Document>>( |
| messenger, |
| kChannelName, |
| &flutter::JsonMethodCodec::GetInstance())), |
| delegate_(delegate), |
| active_model_(nullptr) { |
| channel_->SetMethodCallHandler( |
| [this]( |
| const flutter::MethodCall<rapidjson::Document>& call, |
| std::unique_ptr<flutter::MethodResult<rapidjson::Document>> result) { |
| HandleMethodCall(call, std::move(result)); |
| }); |
| } |
| |
| TextInputPlugin::~TextInputPlugin() = default; |
| |
| void TextInputPlugin::ComposeBeginHook() { |
| if (active_model_ == nullptr) { |
| return; |
| } |
| active_model_->BeginComposing(); |
| if (enable_delta_model) { |
| std::string text = active_model_->GetText(); |
| TextRange selection = active_model_->selection(); |
| TextEditingDelta delta = TextEditingDelta(text); |
| SendStateUpdateWithDelta(*active_model_, &delta); |
| } else { |
| SendStateUpdate(*active_model_); |
| } |
| } |
| |
| void TextInputPlugin::ComposeCommitHook() { |
| if (active_model_ == nullptr) { |
| return; |
| } |
| std::string text_before_change = active_model_->GetText(); |
| TextRange selection_before_change = active_model_->selection(); |
| TextRange composing_before_change = active_model_->composing_range(); |
| std::string composing_text_before_change = text_before_change.substr( |
| composing_before_change.start(), composing_before_change.length()); |
| active_model_->CommitComposing(); |
| |
| // We do not trigger SendStateUpdate here. |
| // |
| // Until a WM_IME_ENDCOMPOSING event, the user is still composing from the OS |
| // point of view. Commit events are always immediately followed by another |
| // composing event or an end composing event. However, in the brief window |
| // between the commit event and the following event, the composing region is |
| // collapsed. Notifying the framework of this intermediate state will trigger |
| // any framework code designed to execute at the end of composing, such as |
| // input formatters, which may try to update the text and send a message back |
| // to the engine with changes. |
| // |
| // This is a particular problem with Korean IMEs, which build up one |
| // character at a time in their composing region until a keypress that makes |
| // no sense for the in-progress character. At that point, the result |
| // character is committed and a compose event is immedidately received with |
| // the new composing region. |
| // |
| // In the case where this event is immediately followed by a composing event, |
| // the state will be sent in ComposeChangeHook. |
| // |
| // In the case where this event is immediately followed by an end composing |
| // event, the state will be sent in ComposeEndHook. |
| } |
| |
| void TextInputPlugin::ComposeEndHook() { |
| if (active_model_ == nullptr) { |
| return; |
| } |
| std::string text_before_change = active_model_->GetText(); |
| TextRange selection_before_change = active_model_->selection(); |
| active_model_->CommitComposing(); |
| active_model_->EndComposing(); |
| if (enable_delta_model) { |
| std::string text = active_model_->GetText(); |
| TextEditingDelta delta = TextEditingDelta(text); |
| SendStateUpdateWithDelta(*active_model_, &delta); |
| } else { |
| SendStateUpdate(*active_model_); |
| } |
| } |
| |
| void TextInputPlugin::ComposeChangeHook(const std::u16string& text, |
| int cursor_pos) { |
| if (active_model_ == nullptr) { |
| return; |
| } |
| std::string text_before_change = active_model_->GetText(); |
| TextRange composing_before_change = active_model_->composing_range(); |
| active_model_->AddText(text); |
| cursor_pos += active_model_->composing_range().extent(); |
| active_model_->UpdateComposingText(text); |
| active_model_->SetSelection(TextRange(cursor_pos, cursor_pos)); |
| std::string text_after_change = active_model_->GetText(); |
| if (enable_delta_model) { |
| TextEditingDelta delta = TextEditingDelta( |
| fml::Utf8ToUtf16(text_before_change), composing_before_change, text); |
| SendStateUpdateWithDelta(*active_model_, &delta); |
| } else { |
| SendStateUpdate(*active_model_); |
| } |
| } |
| |
| void TextInputPlugin::HandleMethodCall( |
| const flutter::MethodCall<rapidjson::Document>& method_call, |
| std::unique_ptr<flutter::MethodResult<rapidjson::Document>> result) { |
| const std::string& method = method_call.method_name(); |
| |
| if (method.compare(kShowMethod) == 0 || method.compare(kHideMethod) == 0) { |
| // These methods are no-ops. |
| } else if (method.compare(kClearClientMethod) == 0) { |
| if (active_model_ != nullptr && active_model_->composing()) { |
| active_model_->CommitComposing(); |
| active_model_->EndComposing(); |
| SendStateUpdate(*active_model_); |
| } |
| delegate_->OnResetImeComposing(); |
| active_model_ = nullptr; |
| } else if (method.compare(kSetClientMethod) == 0) { |
| if (!method_call.arguments() || method_call.arguments()->IsNull()) { |
| result->Error(kBadArgumentError, "Method invoked without args"); |
| return; |
| } |
| const rapidjson::Document& args = *method_call.arguments(); |
| |
| const rapidjson::Value& client_id_json = args[0]; |
| const rapidjson::Value& client_config = args[1]; |
| if (client_id_json.IsNull()) { |
| result->Error(kBadArgumentError, "Could not set client, ID is null."); |
| return; |
| } |
| if (client_config.IsNull()) { |
| result->Error(kBadArgumentError, |
| "Could not set client, missing arguments."); |
| return; |
| } |
| client_id_ = client_id_json.GetInt(); |
| auto enable_delta_model_json = client_config.FindMember(kEnableDeltaModel); |
| if (enable_delta_model_json != client_config.MemberEnd() && |
| enable_delta_model_json->value.IsBool()) { |
| enable_delta_model = enable_delta_model_json->value.GetBool(); |
| } |
| input_action_ = ""; |
| auto input_action_json = client_config.FindMember(kTextInputAction); |
| if (input_action_json != client_config.MemberEnd() && |
| input_action_json->value.IsString()) { |
| input_action_ = input_action_json->value.GetString(); |
| } |
| input_type_ = ""; |
| auto input_type_info_json = client_config.FindMember(kTextInputType); |
| if (input_type_info_json != client_config.MemberEnd() && |
| input_type_info_json->value.IsObject()) { |
| auto input_type_json = |
| input_type_info_json->value.FindMember(kTextInputTypeName); |
| if (input_type_json != input_type_info_json->value.MemberEnd() && |
| input_type_json->value.IsString()) { |
| input_type_ = input_type_json->value.GetString(); |
| } |
| } |
| active_model_ = std::make_unique<TextInputModel>(); |
| } else if (method.compare(kSetEditingStateMethod) == 0) { |
| if (!method_call.arguments() || method_call.arguments()->IsNull()) { |
| result->Error(kBadArgumentError, "Method invoked without args"); |
| return; |
| } |
| const rapidjson::Document& args = *method_call.arguments(); |
| |
| if (active_model_ == nullptr) { |
| result->Error( |
| kInternalConsistencyError, |
| "Set editing state has been invoked, but no client is set."); |
| return; |
| } |
| auto text = args.FindMember(kTextKey); |
| if (text == args.MemberEnd() || text->value.IsNull()) { |
| result->Error(kBadArgumentError, |
| "Set editing state has been invoked, but without text."); |
| return; |
| } |
| auto base = args.FindMember(kSelectionBaseKey); |
| auto extent = args.FindMember(kSelectionExtentKey); |
| if (base == args.MemberEnd() || base->value.IsNull() || |
| extent == args.MemberEnd() || extent->value.IsNull()) { |
| result->Error(kInternalConsistencyError, |
| "Selection base/extent values invalid."); |
| return; |
| } |
| // Flutter uses -1/-1 for invalid; translate that to 0/0 for the model. |
| int selection_base = base->value.GetInt(); |
| int selection_extent = extent->value.GetInt(); |
| if (selection_base == -1 && selection_extent == -1) { |
| selection_base = selection_extent = 0; |
| } |
| active_model_->SetText(text->value.GetString()); |
| active_model_->SetSelection(TextRange(selection_base, selection_extent)); |
| |
| base = args.FindMember(kComposingBaseKey); |
| extent = args.FindMember(kComposingExtentKey); |
| if (base == args.MemberEnd() || base->value.IsNull() || |
| extent == args.MemberEnd() || extent->value.IsNull()) { |
| result->Error(kInternalConsistencyError, |
| "Composing base/extent values invalid."); |
| return; |
| } |
| int composing_base = base->value.GetInt(); |
| int composing_extent = base->value.GetInt(); |
| if (composing_base == -1 && composing_extent == -1) { |
| active_model_->EndComposing(); |
| } else { |
| int composing_start = std::min(composing_base, composing_extent); |
| int cursor_offset = selection_base - composing_start; |
| active_model_->SetComposingRange( |
| TextRange(composing_base, composing_extent), cursor_offset); |
| } |
| } else if (method.compare(kSetMarkedTextRect) == 0) { |
| if (!method_call.arguments() || method_call.arguments()->IsNull()) { |
| result->Error(kBadArgumentError, "Method invoked without args"); |
| return; |
| } |
| const rapidjson::Document& args = *method_call.arguments(); |
| auto x = args.FindMember(kXKey); |
| auto y = args.FindMember(kYKey); |
| auto width = args.FindMember(kWidthKey); |
| auto height = args.FindMember(kHeightKey); |
| if (x == args.MemberEnd() || x->value.IsNull() || // |
| y == args.MemberEnd() || y->value.IsNull() || // |
| width == args.MemberEnd() || width->value.IsNull() || // |
| height == args.MemberEnd() || height->value.IsNull()) { |
| result->Error(kInternalConsistencyError, |
| "Composing rect values invalid."); |
| return; |
| } |
| composing_rect_ = {{x->value.GetDouble(), y->value.GetDouble()}, |
| {width->value.GetDouble(), height->value.GetDouble()}}; |
| |
| Rect transformed_rect = GetCursorRect(); |
| delegate_->OnCursorRectUpdated(transformed_rect); |
| } else if (method.compare(kSetEditableSizeAndTransform) == 0) { |
| if (!method_call.arguments() || method_call.arguments()->IsNull()) { |
| result->Error(kBadArgumentError, "Method invoked without args"); |
| return; |
| } |
| const rapidjson::Document& args = *method_call.arguments(); |
| auto transform = args.FindMember(kTransformKey); |
| if (transform == args.MemberEnd() || transform->value.IsNull() || |
| !transform->value.IsArray() || transform->value.Size() != 16) { |
| result->Error(kInternalConsistencyError, |
| "EditableText transform invalid."); |
| return; |
| } |
| size_t i = 0; |
| for (auto& entry : transform->value.GetArray()) { |
| if (entry.IsNull()) { |
| result->Error(kInternalConsistencyError, |
| "EditableText transform contains null value."); |
| return; |
| } |
| editabletext_transform_[i / 4][i % 4] = entry.GetDouble(); |
| ++i; |
| } |
| Rect transformed_rect = GetCursorRect(); |
| delegate_->OnCursorRectUpdated(transformed_rect); |
| } else { |
| result->NotImplemented(); |
| return; |
| } |
| // All error conditions return early, so if nothing has gone wrong indicate |
| // success. |
| result->Success(); |
| } |
| |
| Rect TextInputPlugin::GetCursorRect() const { |
| Point transformed_point = { |
| composing_rect_.left() * editabletext_transform_[0][0] + |
| composing_rect_.top() * editabletext_transform_[1][0] + |
| editabletext_transform_[3][0] + composing_rect_.width(), |
| composing_rect_.left() * editabletext_transform_[0][1] + |
| composing_rect_.top() * editabletext_transform_[1][1] + |
| editabletext_transform_[3][1] + composing_rect_.height()}; |
| return {transformed_point, composing_rect_.size()}; |
| } |
| |
| void TextInputPlugin::SendStateUpdate(const TextInputModel& model) { |
| auto args = std::make_unique<rapidjson::Document>(rapidjson::kArrayType); |
| auto& allocator = args->GetAllocator(); |
| args->PushBack(client_id_, allocator); |
| |
| TextRange selection = model.selection(); |
| rapidjson::Value editing_state(rapidjson::kObjectType); |
| editing_state.AddMember(kSelectionAffinityKey, kAffinityDownstream, |
| allocator); |
| editing_state.AddMember(kSelectionBaseKey, selection.base(), allocator); |
| editing_state.AddMember(kSelectionExtentKey, selection.extent(), allocator); |
| editing_state.AddMember(kSelectionIsDirectionalKey, false, allocator); |
| |
| int composing_base = model.composing() ? model.composing_range().base() : -1; |
| int composing_extent = |
| model.composing() ? model.composing_range().extent() : -1; |
| editing_state.AddMember(kComposingBaseKey, composing_base, allocator); |
| editing_state.AddMember(kComposingExtentKey, composing_extent, allocator); |
| editing_state.AddMember( |
| kTextKey, rapidjson::Value(model.GetText(), allocator).Move(), allocator); |
| args->PushBack(editing_state, allocator); |
| |
| channel_->InvokeMethod(kUpdateEditingStateMethod, std::move(args)); |
| } |
| |
| void TextInputPlugin::SendStateUpdateWithDelta(const TextInputModel& model, |
| const TextEditingDelta* delta) { |
| auto args = std::make_unique<rapidjson::Document>(rapidjson::kArrayType); |
| auto& allocator = args->GetAllocator(); |
| args->PushBack(client_id_, allocator); |
| |
| rapidjson::Value object(rapidjson::kObjectType); |
| rapidjson::Value deltas(rapidjson::kArrayType); |
| rapidjson::Value deltaJson(rapidjson::kObjectType); |
| |
| deltaJson.AddMember(kDeltaOldTextKey, delta->old_text(), allocator); |
| deltaJson.AddMember(kDeltaTextKey, delta->delta_text(), allocator); |
| deltaJson.AddMember(kDeltaStartKey, delta->delta_start(), allocator); |
| deltaJson.AddMember(kDeltaEndKey, delta->delta_end(), allocator); |
| |
| TextRange selection = model.selection(); |
| deltaJson.AddMember(kSelectionAffinityKey, kAffinityDownstream, allocator); |
| deltaJson.AddMember(kSelectionBaseKey, selection.base(), allocator); |
| deltaJson.AddMember(kSelectionExtentKey, selection.extent(), allocator); |
| deltaJson.AddMember(kSelectionIsDirectionalKey, false, allocator); |
| |
| int composing_base = model.composing() ? model.composing_range().base() : -1; |
| int composing_extent = |
| model.composing() ? model.composing_range().extent() : -1; |
| deltaJson.AddMember(kComposingBaseKey, composing_base, allocator); |
| deltaJson.AddMember(kComposingExtentKey, composing_extent, allocator); |
| |
| deltas.PushBack(deltaJson, allocator); |
| object.AddMember(kDeltasKey, deltas, allocator); |
| args->PushBack(object, allocator); |
| |
| channel_->InvokeMethod(kUpdateEditingStateWithDeltasMethod, std::move(args)); |
| } |
| |
| void TextInputPlugin::EnterPressed(TextInputModel* model) { |
| if (input_type_ == kMultilineInputType) { |
| std::u16string text_before_change = fml::Utf8ToUtf16(model->GetText()); |
| TextRange selection_before_change = model->selection(); |
| model->AddText(u"\n"); |
| if (enable_delta_model) { |
| TextEditingDelta delta(text_before_change, selection_before_change, |
| u"\n"); |
| SendStateUpdateWithDelta(*model, &delta); |
| } else { |
| SendStateUpdate(*model); |
| } |
| } |
| auto args = std::make_unique<rapidjson::Document>(rapidjson::kArrayType); |
| auto& allocator = args->GetAllocator(); |
| args->PushBack(client_id_, allocator); |
| args->PushBack(rapidjson::Value(input_action_, allocator).Move(), allocator); |
| |
| channel_->InvokeMethod(kPerformActionMethod, std::move(args)); |
| } |
| |
| } // namespace flutter |
